Quote:
Originally Posted by MercedesRover
The tin pot on the back of the pump is the fuel shut off. It's the white plastic thingy on top of the pump that I'm wondering about.
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The "white plastic thingy" is the vacuum control valve. Manifold vacuum connectes to the top of the valve and goes onto the transmission. The valve bleeds off vacuum and the transmission vacuum is regulated depending on pedal position.